# Draft California 2012 Integrated Report( 303(d) List/305(b) Report)

# Supporting Information

## Regional Board 6 - Lahontan Region

Water Body Name: | Swauger Creek
Water Body ID: | CAR6304001220011130122006
Water Body Type: | River & Stream

DECISION ID | 20454 | Region 6
Swauger Creek

Pollutant: | Phosphorus
Final Listing Decision: | List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2010)
Revision Status | Original
Sources: | Atmospheric Deposition | Erosion/Siltation | Highway/Road/Bridge Runoff | Natural Sources | Nonpoint Source | Pasture Grazing-Riparian and/or Upland | Range Grazing-Riparian and/or Upland | Streambank Modification/Destabilization | Surface Runoff
Expected TMDL Completion Date: | 2019
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | Regional Board Conclusion: This pollutant was considered for placement on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: 303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.
Regional Board Staff Decision Recommendation: | No new data were assessed for this assessment cycle. The conclusion reached in the previous cycle remains in same. The Regional Board will update this decision when new data and information become available in a future assessment cycle.

Line of Evidence (LOE) for Decision ID 20454, Phosphorus | Region 6
Swauger Creek
LOE ID: | 4638
Pollutant: | Phosphorus
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Not Recorded
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 0
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: | Placeholder reference pre-2006 303(d)
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | Unspecified
Objective/Criterion Reference: | Placeholder reference pre-2006 303(d)
Evaluation Guideline: | Unspecified
Guideline Reference: | Placeholder reference pre-2006 303(d)
Spatial Representation: | Unspecified
Temporal Representation: | Unspecified
Environmental Conditions: | Unspecified
QAPP Information: | Unspecified
QAPP Information Reference(s):

DECISION ID | 28550 | Region 6
Swauger Creek

Pollutant: | Fecal Coliform
Final Listing Decision: | List on 303(d) list (being addressed by action other than TMDL)
Last Listing Cycle's Final Listing Decision: | List on 303(d) list (being addressed by action other than TMDL)(2010)
Revision Status | Original
Sources: | Natural Sources | Onsite Wastewater Systems (Septic Tanks) | Pasture Grazing-Riparian and/or Upland | Range Grazing-Riparian and/or Upland | Recreational and Tourism Activities (non-boating)
Expected Attainment Date: | 2027
Date TMDL Approved by USEPA: | This listing is being addressed through Lahontan RWQCB Resolution R6T-2007-0019, Waiver of Waste Discharge Requirements for Grazing Operations in the East Walker River Watershed (Bridgeport Valley and Tributaries) of the Lahontan Region. Nonpoint source management measures for grazing operations are to be implemented under Ranch Water Quality Management Plans. The waiver includes a time schedule, milestones and a monitoring and reporting program. An interim target, a 30-day average log-normalized fecal coliform concentration of no more than 200 fecal coliform colonies per 100 mL, is expected to be attained within the five year lifetime of the waiver. The water quality objective is expected to be attained through continued implementation and improvement of management practices. The waiver is subject to renewal.
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | Regional Board conclusion: This pollutant was considered for placement on the section 303(d) list in a previous cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for removal from the section 303(d) list under section 2.2 of the Listing Policy. Under 2.2 of the Policy, a minimum of one line of evidence is needed to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a regulatory action other than a TMDL (a conditional waiver of waste discharge requirements) is expected to result in attainment of the standard. The waiver was adopted by the Lahontan RWQCB on June 13, 2007 and is now being implemented. The listing was previously for "Pathogens" the pollutant name has been changed to "Fecal Coliform" for clarity and consistency.
Regional Board Staff Decision Recommendation: | No new data were assessed for this assessment cycle. The conclusion reached in the previous cycle remains the same. The Regional Board will update this decision when new data and information become available in a future assessment cycle. This waterbody is now being evaluated for fecal coliform and no longer pathogens (the 2006 placeholder LOE). All future LOEs used to make decisions will be specified by the indicator bacteria.

Line of Evidence (LOE) for Decision ID 28550, Fecal Coliform | Region 6
Swauger Creek
LOE ID: | 4637
Pollutant: | Pathogens
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Not Recorded
Beneficial Use: | Water Contact Recreation
Number of Samples: | 0
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: | Placeholder reference pre-2006 303(d)
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | Unspecified
Objective/Criterion Reference: | Placeholder reference pre-2006 303(d)
Evaluation Guideline: | Unspecified
Guideline Reference: | Placeholder reference pre-2006 303(d)
Spatial Representation: | Unspecified
Temporal Representation: | Unspecified
Environmental Conditions: | Unspecified
QAPP Information: | Unspecified
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 28550, Fecal Coliform | Region 6
Swauger Creek
LOE ID: | 27589
Pollutant: | Fecal Coliform
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Water Contact Recreation
Number of Samples: | 16
Number of Exceedances: | 5
Data and Information Type: | Water column surveys (e.g. fecal coliform)
Data Used to Assess Water Quality: | Swauger Creek was placed on the Section 303(d) list in 2002 as a result of sampling in 2000 and 2001 by the U.S. Geological Survey. At least 5 of 16 monthly fecal coliform samples exceeded the 40 colonies per 100 mL limit. Fecal coliform counts ranged from 1 to 250 colonies per 100 mL. Some of the sampling results were reported with a "K" code indicating that the bacteria count was outside of the acceptable range or ideal count of 20-60 colonies per plate. These USGS data were part of the longer study referenced as Rockwell and Honeywell.
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002
| 2007. SWAMP Data for the West Walker River and East Walker River Hydrologic Units
SWAMP Data: | SWAMP
Water Quality Objective/Criterion: | The Lahontan Basin Plan's regionwide Water Quality objective for coliform bacteria states: "Waters shall not contain concentrations of coliform organisms attributable to anthropogenic sources, including human and livestock wastes. The fecal coliform concentration during any 30-day period shall not exceed a log mean of 20/100 ml, nor shall more than 10 percent of all samples collected during any 30-day period exceed 40/100 ml. The log mean shall ideally be based on a minimum of not less than five samples collected as evenly spaced as practicable during any 30-day period. However, a log mean concentration exceeding 20/100 ml for any 30-day period shall indicate violation of this objective even if fewer than five samples were collected."
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | One station was sampled.
Temporal Representation: | Buckeye Creek was sampled monthly between April 2000 and June 2001.
Environmental Conditions: | Swauger Creek originates in the Sweetwater Moutnains and flows south and southeast near Highway 395 before joining Buckeye Creek west of Bridgeport Reservoir. Livestock grazing is the main human land use in the watershed.
QAPP Information: | The study was done using USGS quality assurance procedures.
QAPP Information Reference(s):